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	Sun, 03 Sep 2006 13:39:00 PDT
Date: Sun, 3 Sep 2006 13:39:00 -0700 (PDT)
From: backyard <backyard1454-bsd@yahoo.com>
To: stan <stanb@panix.com>, ?????? ????? <bug2bug@bug2bug.tk>
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Cc: freebsd-questions@freebsd.org
Subject: Re: A question about programming RS-232
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--- stan <stanb@panix.com> wrote:

> On Sun, Sep 03, 2006 at 11:26:04PM +0600, ??????
> ????? wrote:
> > Hello.
> > I have a question I can't deal myself.
> > And nobody can help me in resolving my problem.
> > 
> > Problem:
> > I have a hand-made device, I want to control from
> FreeBSD 6.1
> > (I am porting this application from Windows
> equivalent).
> > But I don't know, in what device /dev/ I should
> write to get reults.
> > I tryed to write bytes into /dev/ttyd0,
> /dev/cuad0, but got nothing. :(
> > 
> Start off by using minicom (or cu) to talk to the
> device. By doing
> this you can sort through baud rate/parity,hardware
> issues.
> 
> Once you have that working, then move on to code.
> 
> -- 
> Unix is very simple, but it takes a genius to
> understand the simplicity.
> (Dennis Ritchie)
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> 

does your handmade device use RS-232? If its PIC or
some such microcontroller based they claim to be
RS-232 compliant but they do not always use +12V and
-12V levels. MAX-232 chips can correct this. I assume
if it worked in windows for you this might not the
case, but you never know.


-brian